i did a wash, the clay bar, another wash 2 coats of Z5 and one coat of Z2 and it only took about 5 hours. the stuff goes on and comes off pretty easily.
the Z5 is amazing. when i first moved into my apartment something dripped off the ceiling when it rained and dried on my car. i almost never got it off...and scratched my paint up in the process. the last time i zainoed my car i rubbed the Z5 into that spot really well and after 2 coats you can hardly tell the scratches were ever there. only 1 or 2 tiny ones are left... i was quite amazed...